124 1010
Coffey, Michael T. and James W. Hannigan
National Center for Atmospheric Research, Boulder, CO, USA 
Fourier transform spectrometer (FTS) from the T1 site in MILAGRO 
Observation date:20060314
1 1
2006 03 21   2006 03 21
0
Time (UT), seconds after 00:00 of observation date   
52
1e+12 1e+12 1e+16 1e+16 1e+13 1e+13 1e+16 1e+16 1e+17 1e+17 1e+15 1e+15 
1e+13 1e+13 1e+13 1e+13 1e+18 1e+18 1e+19 1e+19 1e+13 1e+13 1e+13 1e+13 
1e+13 1e+13 1e+13 1e+13 1e+17 1e+17 1e+17 1e+17 1e+13 1e+13 1e+13 1e+13 
1e+12 1e+12 1e+13 1e+13 1e+13 1e+13 1e+13 1e+13 1e+13 1e+13 1e+13 1e+13 
1e+13 1e+13 1e+13 1e+13  
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999  
HF vertical column amount [molecules/cm**2]
HF estimated error in total column [molecules/cm**2]
O3 vertical column amount [molecules/cm**2]
O3 estimated error in total column [molecules/cm**2]
HCL vertical column amount [molecules/cm**2]
HCL estimated error in total column [molecules/cm**2]
N2O vertical column amount [molecules/cm**2]
N2O estimated error in total column [molecules/cm**2]
CH4 vertical column amount [molecules/cm**2]
CH4 estimated error in total column [molecules/cm**2]
CO vertical column amount [molecules/cm**2]
CO estimated error in total column [molecules/cm**2]
HNO3 vertical column amount [molecules/cm**2]
HNO3 estimated error in total column [molecules/cm**2]
CLONO2 vertical column amount [molecules/cm**2]
CLONO2 estimated error in total column [molecules/cm**2]
H2O vertical column amount [molecules/cm**2]
H2O estimated error in total column [molecules/cm**2]
N2 vertical column amount [molecules/cm**2]
N2 estimated error in total column [molecules/cm**2]
COF2 vertical column amount [molecules/cm**2]
COF2 estimated error in total column [molecules/cm**2]
NO vertical column amount [molecules/cm**2]
NO estimated error in total column [molecules/cm**2]
NO2 vertical column amount [molecules/cm**2]
NO2 estimated error in total column [molecules/cm**2]
CCL2F2 vertical column amount [molecules/cm**2]
CCL2F2 estimated error in total column [molecules/cm**2]
HDO vertical column amount [molecules/cm**2]
HDO estimated error in total column [molecules/cm**2]
CH3D vertical column amount [molecules/cm**2]
CH3D estimated error in total column [molecules/cm**2]
C2H6 vertical column amount [molecules/cm**2]
C2H6 estimated error in total column [molecules/cm**2]
OCS vertical column amount [molecules/cm**2]
OCS estimated error in total column [molecules/cm**2]
H2CO vertical column amount [molecules/cm**2]
H2CO estimated error in total column [molecules/cm**2]
HCN vertical column amount [molecules/cm**2]
HCN estimated error in total column [molecules/cm**2]
CCL3F vertical column amount [molecules/cm**2]
CCL3F estimated error in total column [molecules/cm**2]
C3H8 vertical column amount [molecules/cm**2]
C3H8 estimated error in total column [molecules/cm**2]
C2H2 vertical column amount [molecules/cm**2]
C2H2 estimated error in total column [molecules/cm**2]
NH3 vertical column amount [molecules/cm**2]
NH3 estimated error in total column [molecules/cm**2]
C2H4 vertical column amount [molecules/cm**2]
C2H4 estimated error in total column [molecules/cm**2]
PAN vertical column amount [molecules/cm**2]
PAN estimated error in total column [molecules/cm**2]
11
1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
9999 9999 9999 9999 9999 9999 9999 9999 9999 9999 9999
Day of year of observation
Year of observation 
Month of observation 
Day of observation 
Hour of observation 
Minute of observation 
Second of observation 
Latitude of observation (degree N)
Longitude of observation (degree W)
Altitude of observation (km)       
Solar zenith angle (degree)
29
Data were taken by a 0.06cm-1 resolution Fourier transform spectrometer (FTS) operated
from a trailer situated(usually) at the T1 site of MILAGRO (19.7 N, 98.98 W).  The absorption
of infrared solar radiation along a slant path to the sun is recorded from 2 to 15 micrometers.
Two spectral filters are used to cover the region from 2-15 microns.  An interferogram is 
recorded in about 10 seconds.  Interferograms are transformed to produce spectra.  Column
amounts are retrieved by fitting the observed spectra using the non-linear least squares 
fitting code, SFIT2, that employs an Optimal Estimation retrieval algorithm.  Version 3.92 
of the SFIT2 code was used. The HITRAN absorption line list with updates to 2004 is used
in the forward calculation.  An average temperature profile was derived from NCEP analyses.  
Observations were made during sunlit hours throughout the day.  Vertical column amounts
are reported above the observing location.  Details of the instrumentation and method may
be found in:

Airborne spectroscopic observations of chlorine activation and de-nitrification in the 
1999/2000 winter Arctic stratosphere during SOLVE, M. T. Coffey, W. G. Mankin,
J. W. Hannigan, and G. C. Toon, J. Geophys. Res., 107, 8303, 2002.

Intercomparison of retrieval codes used for the analysis of high-resolution, ground-based 
FTIR measurements, F. Hase, J. W. Hannigan, M. T. Coffey, A. Goldman, M. Hopfner, 
N. B. Jones, C. P. Rinsland, S. W. Wood, Quant. Spectrosc. Radiat. Transfer, 87, 25-52, 2004.  

Contacts:
Michael T. Coffey
James W. Hannigan
National Center for Atmospheric Research
PO Box 3000
Boulder, CO 80307
303 497 1407
coffey@ucar.edu, jamesw@ucar.edu
7
SECONDS(UT) DOY YEAR MONTH DAY  HOUR MIN SEC  LAT LON ALT SZA
     HF ERR      O3 ERR     HCL ERR     N2O ERR     CH4 ERR      CO ERR 
   HNO3 ERR  CLONO2 ERR     H2O ERR      N2 ERR    COF2 ERR      NO ERR 
    NO2 ERR  CCL2F2 ERR     HDO ERR    CH3D ERR    C2H6 ERR     OCS ERR 
   H2CO ERR     HCN ERR   CCL3F ERR    C3H8 ERR    C2H2 ERR     NH3 ERR 
   C2H4 ERR     PAN ERR 

055511 073 2006 03 14 15 25 12 +19.70 +98.98   2.27 53.81
99999 99999 99999 99999 99999 99999 99999 99999 00313 00040 01511 00232 
99999 99999 99999 99999 37200 08096 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 298760 63699 99999 99999 01796 00283 00781 00111 
00484 00088 99999 99999 99999 99999 00356 00080 00110 00023 99999 99999 
99999 99999 99999 99999 
055813 073 2006 03 14 15 30 14 +19.70 +98.98   2.27 52.83
99999 99999 00754 00084 99999 99999 00499 00062 99999 99999 99999 99999 
00622 00055 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00930 00133 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00405 00059 99999 99999 99999 99999 01403 00318 
00113 00021 99999 99999 
056091 073 2006 03 14 15 34 51 +19.70 +98.98   2.27 51.80
99999 99999 99999 99999 99999 99999 99999 99999 00313 00039 01548 00237 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 302490 64570 99999 99999 01763 00285 00826 00116 
00488 00089 99999 99999 99999 99999 00361 00081 00110 00023 99999 99999 
99999 99999 99999 99999 
075570 073 2006 03 14 20 59 30 +19.70 +98.98   2.27 39.53
99999 99999 99999 99999 99999 99999 99999 99999 00290 00036 01605 00250 
99999 99999 99999 99999 49085 11172 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 376230 83238 99999 99999 01459 00229 00820 00115 
00462 00083 99999 99999 99999 99999 00356 00080 00109 00023 99999 99999 
99999 99999 99999 99999 
076979 073 2006 03 14 21 22 59 +19.70 +98.98   2.27 44.47
99999 99999 00729 00084 99999 99999 00474 00060 99999 99999 99999 99999 
00682 00060 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00781 00111 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00369 00053 99999 99999 99999 99999 02285 00523 
00084 00015 99999 99999 
078514 073 2006 03 14 21 48 34 +19.70 +98.98   2.27 49.97
99999 99999 99999 99999 99999 99999 99999 99999 00316 00041 01795 00289 
99999 99999 99999 99999 53293 12189 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 404350 91646 99999 99999 01520 00243 00801 00113 
00484 00088 99999 99999 99999 99999 00358 00081 00109 00023 99999 99999 
99999 99999 99999 99999 
078739 073 2006 03 14 21 52 19 +19.70 +98.98   2.27 50.79
99999 99999 00761 00084 99999 99999 00470 00060 99999 99999 99999 99999 
00679 00060 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00780 00111 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00375 00054 99999 99999 99999 99999 02437 00558 
00090 00016 99999 99999 
